The Billionaire’s Commitment by Johanna Evelyn

Money may save her life, but it can’t promise love.
Living in New York was too expensive, so when the medical bills pile up Ensley Morgan lets the dartboard choose where she’s going to live next. When fate chooses Texas she doesn’t look back, until a handsome doctor weasels into her life—and her heart. But falling for her doctor comes with a price she’s not willing to pay.
Peter Bridgeport has dealt with many stubborn patients, but never one so uncompromising as Ensley. Her life hangs on her last treatment option, but she refuses treatment because of the cost. He’s never crossed patient boundaries until the determined redhead came into his life. Now he’s paying for her treatment anonymously and bumping into her out of the clinic.
When he saves her from more than her illness, their chemistry ignites. He realizes it’s time for her to see a new doctor. Only she finds out about his lies and wants nothing to do with him.
Now he needs to convince her to stay before a dart takes her out of his life as quickly as it brought her in it.